Sh abpeneb fob disk harbors



APPLICATION FILED AUBJ. I918.

Patented May 6, 1919.

WITNESSES mvmron Le Roy l/aines m: mums urns m. macro-um I end a clamp 11 UNITED STATES PATENT OFFICE... f

LE ROY HAINES, OE COLOI-IESTER, ILLINOIS.

AIWENER FOR DISK AW Application filed August 8, 1918.

To allvwkozrt it may cont-cm Be it known that I, Ln R01 Hnmns, a citi-, zen of the United States, and a resident of (Jolchester, in the county of McDonough and State of Illinois, have invented a new and Im roved Sharpener for Disk Harrows, of whic 1 the followingis a description.

My invention relates to a tool for sharp ening disks, a-ndmore particularly relates to a tool-to automaticall sharpen harrow disks while the harrow ism operation.

An object of the invention is to provide a tool adapted to be secured at one end to the scraper bar shaft of that type of harrow in which the scraper bar shaft is subject to the tension of a torsion spring; and also to provide means to hold a file, a cuttin steel, or

thelike, in position to be yielding y pressed against the edge of a disk of the harrow an der the tension of the scraper bar shaft and in proper an lan relatipn to the disk so that thelatter wi ll be sharpened in the turning h reof. while... egular y. n pe ation.

An important object of the invention also,

is to provide in a device of the class referred to, clampin means for the sharpening medium and t e scraper bar shaft and so constructed and arranged as to promote convenicnce and economize time and labor in applying the tool to the harrow, and in positioning the sharpening medium.

Reference is to be had to the accompany ing drawings forming a art of this specification, it bei'n unders that the drawings are merely i ustrative of one example of the invention.

Figure 1 is a perspective view of a disk sharpener embodying In invention showin the same in use on a disk harrow illustrate in part;

Fig. 2 is an enlarged side elevation of my improved device partly broken away, the view indicating in section the scraper bar shaft of the harrow and a sharpening medium in the form of a file.

In the illustration the letter A indicates disks of aharrow, mounted in the usual man ner, and B, the scraper bars mounted on the scraper bar shaft G which is under the tension of a torsion s ring D. My improved device includes a 0 e bar 10 carryin at one apted to be applie to the shaft G and car mg at the other end a clamp 12 for the s arpening medium. The yoke is provided at the ends with ball heads 13 and the two jaws comprised in each Specification of Letters Patent.

Patented May 6-, 1e 19.

Serial no. 248,952 I the jaws and similarly, the'clamp 12 has a transverse clamp bolt 16.

The clamp 11 on the opposed faces of the jaws has lugs 17 disposed inward from that end of the clamp opposite the head 13 so that the clamp bolt passes through the jaws between the lugs 17 andthe concave seats 14 and thereby, serves to effect a tight clamping of the jaws 13 in rigid relation to the yoke bar 10 and tightly grippi the shaft C. The shaft therefore, as will e best seen in Fig, 2, is accommodated between the jaws outward-of the lugs 17 which are pressed ain he aft inp s ning he clamp 011 said shaft On the ja-FVS i h 61 3 11 9 2 at the opposite end from the clamp of'the seats re ormed. lugs. 19. which it will. be oh: servedlare inward from the ends of the jaws and also within the side surfaces of the jaws, whereby the jaws accommodate a rasp 18, a cutting steel, or like sharpenin medium, the lugs serving to osition the s arpening medium 18 and a so as a resistance thereto under the sharpening pressure.

In practice the shaft 0 is turned to take up the slack of the spring D thereof and the clamp 11 is secured to the shaft at the proper angle so that the sharpenin device will be subject to the tension of t e shaft. With the sharpenin medium 18 given the proper angle relative y to the edge of a disk A, the

tension of the shaft C will maintain said sharpening medium yieldingl against the disk irrespective of the deviation of the latter from its general plane of revolution in the operation of the harrow. Thus, the tension of the scraper bar shaft is utilized to maintain the proper contact of the sharpening medium with the disk while the clamps are capable of individual adjustment to vary their angular positions on the yoke for the proper positioning of the tool.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention I do not limit myself strictly to the mechanical details herein illustrated, since manifestly the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

Having thus described my imention, I claim as new, and desire to secure by Letters Patent:

1. A tool for sharpening disk barrows, including a yoke bar having ball heads at its ends,'a pair of clamp jaws having seats in the opposite faces thereof near one end to bear on one of said heads at opposite sides thereof, lugs on the opposed faces of said jaws inward from the ends thereof and i11 ward from the side surfaces of the jaws against which lugs a sharpening medium may be placed and be accommodated between the ends of the jaws, a clamp bolt transverse to the jaws between said seats and said lugs to jointly bind the aws on the adjacent head of the yoke and on the sharpening medium, a second pair of clamp jaws having seats on olpposed faces thereof to engage the ball on t e opposite end of the yoke, and a clamp bolt for said second pair of jaws, the latter jaws having lugs on the opposite faces between the ends of the jaws and the bolt of the latter tobea'r against the scraper shaft of a harrow, said bolt being adapted to clamp the jaws on the scraper shaft and against the adjacent head of the yoke bar.

2. A tool for use in sharpening dis-k harrows, including a clamp adapted to hold a sharpening medium, a carrier bar shaped to present flaring ends on one of which said Copies at this patent may be obtained for five cents each, by addrei sing Washington, D. 6.,

clamp is secured to permit :1 universal adustment, and a second clamp on the opposite end of said carrier bar and adapted to engage the scraper bar shaft of a disk har- 3. A tool for use in sharpenin disk harrows including a yoke having ba 1 heads at its ends, clam) jaws having seats near one end thereof to ind against one of said heads at opposite sides thereof, lugs on the opposed faces of the jaws inward from the opposite ends thereof, and inward from the side surfaces of said jaws against which lugs a sharpening medium may be placed, a clamp bolt transverse to the aws between said seats and said lugs, a second pair of clamp jaws adapted to bind on the opposite head of said yoke, and a clamp bolt for said second pair of jaws, the latter j aws havin lugs on the opposite faces bQ't-WGBH the cuts of the jaws and the bolt.

LE ROY HAINES.

the (iommissioner or gatent's 

